Where do constellations come from?

How are constellations formed? How many stars are there? What are stars made of? Why are there stars in the sky? Why are stars white? Why are some stars red? Why do stars twinkle? Why do we only see the stars at night? Why is the north star always facing north? We answer your questions about the stars and astronomy with Talia Sepersky of the Museum of Science in Boston.

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